Valve spring tool device



Jan. 16, 1968 R. D. HASELMO 3,363,3U2

VALVE SPRING TOOL DEVICE Filed Oct. 21, 1965 FEE} w 2.9 /25 I /27 G o a INVENTOR Haber? D. Husaimo ATTORNEY United States Patent 3,363,302 VALVE SPRING TOOL DEVICE Robert D. Haselmo, Park River, N. Dak. 58270 Filed Oct. 21, 1965, Ser. No. 499,787 2 Claims. (Cl. 29215) ABSTRACT OF THE DISCLOSURE The invention is a tool for removing compression springs from the head of an engine. The tool includes a plate with forked members at one end and a laterally extending handle at the other end of the plate, said platehas a central bore adapted to receive the rocker arm mounting stem on the head of the engine, said plate having downwardly extending flanges along opposite sides of the forked members for straddling the opposite edges of the compression spring to keep the plate aligned on the compression spring, said forked member having a rounded undersurface for engaging a disc at the top of the compression spring and said handle being adapted to pivot the plate about the axis of the bore to pivot the forked members downward to compress the compression spring so that the valve stem may be disengaged from the disc.

This invention relates to tools and equipment, more particularly, the invention relates to mechanical tools for combustion engines.

It is an object of the invention to provide a novel inexpensive tool for levering and compressing valve springs downward for rapid removal and replacement of the valve spring.

It is a further object of the invention to provide a novel tool which can be easily and rapidly used to install and replace valve springs on conventional engines having individual rocker arm mountings.

It is a further object of the invention to provide a novel inexpensive tool which can be used to install and replace valve springs on engines.

Further objects and advantages of the invention will become apparent as the description proceeds and when taken in conjunction with the accompanying drawing wherein:

FIGURE 1 is a perspective view of the valve tool invention shown in operative position on the rocker arm stem of a head of a conventional engine and engaging the valve spring.

FIGURE 2 is a top plan view of the valve tool invention shown in operative position.

FIGURE 3 is a cross-sectional view of the valve spring tool invention taken along line 33 of FIGURE 2.

FIGURE 4 is a front view of the valve spring tool invention illustrating the tool in engaging relation to the valve spring.

FIGURE 5 is a fragmentary side view of the valve spring tool invention.

Briefly stated, the invention comprises an elongated plate having a forked portion at one end, a handle extending laterally from the opposite end of said plate, said plate having a central bore adapted to receive the stem of the individual rocker arm mounting of a conventional engine and to be held thereon by a nut threaded onto said stern, said forked end adapted to engage the retainer at the top of the valve spring of the engine and compress the valve spring downward, by the operator grasping the handle and pivoting the plate generally about the axis of the nut, air pressure is provided holding the valve stem upward, so that when the tool is used to compress the compression spring, the valve stem does not move down- 3,363,392 Patented Jan. 16, 1968 ward as the spring is compressed and the slip rings may be removed to release the valve spring from the valve stem.

With further more detailed reference to the drawing, in FIGURE 1, the head 29 of a conventional engine is illustrated. The engine is of the type having conventional individual rocker arm mountings or stems 21 for each valve compression spring 22, wherein the rocker arms (not shown) are individually and pivotally mounted on the stems 21 and held in operative position by the threaded nuts 23.

The compression tool invention 24 comprises a rectangular plate 25. The plate 25 has a pair of ribs 26 and 27 which extend along opposite sides of the plate 25 and are fixed thereto. The plate 25 has a cutaway portion forming a pair of diverging legs 28 and 29 at one end which form a forked portion. The plate 25 has a bore 30 centrally of its length. A cylindrical post 31 is fixed to the other end of the plate. The post 31 has a reduced cylindrical portion 31 which receives an elongated hollow metal pipe 32 to form the handle of the tool.

At the forward end of the ribs 26 and 27 are downwardly projecting flange portions 26 and 27'. The fork members 28 and 29 have rounded or curved undersurfaces 28 and 29' which curve forward and upward.

The tool 24 is installed in operative position by removing the threaded nut 23 from the rocker arm stem and removing its rocker arm. The plate 25 is then slid over the stem 21, through bore 30. The bore 30 is elongated and oversized with respect to the stem to accommodate the varying dimensions of different engines.

After the plate 25 has been mounted over the stem 21, the nut 23 is threaded back onto the rocker arm stem, and the tool is now in its operative position as illustrated in FIGURE 3.

At this time, air under pressure will be introduced into the cylinder corresponding to the compression spring desired to be removed. The air under pressure in the cylinder will hold the valve stems 33 of that cylinder upward, in their position illustrated in FIGURES 1-4. This introduction of air under pressure is accomplished by removing one of the spark plugs and inserting an air hose into the spark plug socket and pumping the air into the cylinder through the spark plug socket.

After air has been introduced into the cylinder to hold the valve stems upward the operator will grasp the handle 32 and pivot the plate 25 clockwise when viewed from FIGURE 3, generally about the axis of the nut 23, as indicated by the arrow 34.

The downward projecting flange portions 26 and 27 will straddle the opposite edge of the disc 35 and the opposite edges of the coil spring 22, and will act to keep the plate 25 aligned centrally on the compression spring 22.

As the plate 25 is pivoted clockwise, the curved undersurfaces 23' and 29' of the fork members 28 and 29 as they moved downward will engage the disc or valve spring retainer 35 and force the disc or retainer 35 and compress the valve spring 22 downward. By having the undersurfaces 28' and 29 curved or rounded, the fork members 28 and 29 will continuously engage the disc 35 centrally of the axis of the valve stem 33 as the plate 25 pivots, for an easier, more even compression of the valve spring 22.

The air pressure will hold the valve stem in its position illustrated in FIGURES 2, 3, and 4, as the plate 25 of the tool forces the disc 35 downward which compresses the valve spring 22. Conventional valve keepers or mating half rings 36 and 36' fit into an annular groove in valve stem 33. The valve keepers have conical outer surfaces and the disc or retainer 35 has a conical annular inner edge 35 about its central hole consequently, the compression spring 22 in urging the disc 35 upward, the conical edges 35' of the disc 35 urge the slip rings or valve keepers 36 and 36' together, thereby locking the valve keepers 36 and 36' in the annular groove in the valve stem, thereby locking the disc or retainer 35 to the valve stem.

However, when the operator pivots the plate 25 clockwise pressing the disc 35 downward the valve stem remains in the position shown in FIGURE 3, thereby freeing the valve keepers 36 and 36' in the notches on the valve stem, and the valve keepers 36 and 36 may be removed.

Thereafter, the nut 23 may be removed, and the disc 35 and valve spring 22 removed from the valve stem 33.

The operation may be reversed to install a new valve spring. The operation can be repeated for each valve spring that the operator desires to remove or replace or install.

Thus, it will be seen from the foregoing that a novel tool has been provided for installing, replacing, or removing valve springs.

It will be obvious that various charges and departures may be made to the invention without departing from the spirit and scope thereof and accordingly it is not intended that the invention be limited to that specifically described in the specification or illustrated in the drawing, but only as set forth in the appended claims wherein:

What is claimed is:

1. A tool for removingcompression springs from the head of an engine, said tool comprising a plate, said plate having forked members at one end, a laterally extending handle at the other end of said plate, said plate having a central bore adapted to receive the rocker arm mounting stern on the head of the engine, said plate having downwardly extending flanges along the opposite edges of said forked members for straddling the opposite edges of the compression spring to keep said plate aligned on said compression spring, said forked member having a rounded undersurfa-ce engaging a disc at the top of the compression spring, said handle adapted to pivot the plate about the axis of the bore to pivottthe forked members downward to compress the compression spring so that the valve stem may be disengaged from the disc.

2. A tool for removing compression springs from the head of an engine, said tool comprising a plate, said plate having a forked one end, a handle extending from the other end of said plate, said plate having a bore intermediate its length adapted to receive the rocker arm mounting stern on the head of the engine, said plate having downwardly extending flanges along the opposite edges of said forked members for straddling the opposite edges of the compression spring to keep said plate aligned on said compression spring, said plate adapted to telescope over the rocker arm mounting stern through said bore and pivot about the axis of said bore to pivot the forked one end downward to compress the compression spring so that it may be disengaged from the valve stem.

References Cited UNITED STATES PATENTS 1,253,270 1/1918 Moody et al. 29215 3,110,959 11/1963 Blackstone 29-267 OTHELL M. SIMPSON, Primary Examiner.

J. C. PETERS, Assistant Examiner. 

